Burner of the injector type



July 17, 1923- 1,461,873

- L. GROTE BURNER OF THE INJECTOR TYI'E Filed Aug. 15, 19,22 3 sheets-sheet 1 20 F/G. 2/ 1 July 17, 1923- L. GROTE BURNER OF THE INJECTOR TYPE 3 ts-Sheet 2 Flled Aug 15, 1922 Julfl'z 1923- Willi/[Mill]!!! VIII 1.461.873 L. GROTE BURNER OF THE INJECTOR TYPE Fi led Aug. 15. 1.922 s Sheets-Sheet 5 Fla /4 Y F/ l. /7 F/G. /6 G Patented duly i7, 192%..

amen LUDWIG- GBOTE, OE TOTTENHAIVI, LONDON, ENGLAND.

BURNER 013 THE INJECTOR TYPE.

Application filed August 15, 1922. Serial Ho. 581,926.

T 0 all whom it may concern:

Be it known that I Luowre Gno'rn engh neer a citizen or? the German Republic, re siding at 177 Mount Pleasant Road Tottenam, London, England, have invented oer tain new and useful Improvements in or Re lating to Burners of the Injector Types, of which the following is a specification.

Heretofore a liquid hydrocarbon burner 01'' the injector type has been proposed with a central longitudinal passage or barrel tending from end to end of the burner and having at its rear end a compressed air inlet in alignment with the axis of said bar-1 rel and adapted to deliver said air under pressure direct through said barrel and having a circular enlargement near the rear end of said barrel and in advance of said compressed air inlet with an inlet or inlets "for admitting air at atmospheric pressure or gas or steam to said enlargement, and having an inlet or inlets ior dellvering liquid hydrocarbons laterally into said barrel at a point well In advance of said enlargement and also having an annular steam jacket adapted to deliver through theoutlet end of the ljuirner a ring of steam around the I jet of mingled air and liquid hydrocarbone as said jet leaves theoutlet end of the barrel.

Now the present invention relates to burners or burner apparatus of the aforesaid type but instead of delivering the supply of liquid hydrocarbons or it may be gas (all of which fuels will hereinafter be referred to as the liquid fuel) laterally into the barrel of the apparatus between the enlargement and j the outlet end of the barrel as here'oifore, such liquid fuel supply according to the present invention is delivered into the said enlargement namely according to one arrangement said liquid fuel supply is delivered laterally into the said enlargement adj ommg the com-- pressed air inlet or according to another arrangement is delivered co-axially with the compressed air or steam into said enlargement.

Furthermore I provlde means to permit air from the outside atmosphere to be drawn into said enlargement there to mingle with the fuel and withr'the air delivered through the compressed air inlet; and in one con struction according to this invention 1 provide means to admit air from the outside atmosphere into the barrel of the burner or burner apparatus as hereinafter described,

which barrel is made conical or ta erin a P e gradually and regularly (symmetrically ranged to deliver said annular ring of air or steam through theo'utlet end of the burner at an acute angle to the longitudiual axis Ofthe barrel 01 the burner so as to cause said ring of air or steam to be directed forcibly at a point close to the exit end of said barrel into the mixture of liquid fuel and air emerging from the barrel outi let or nozzle.

In one construction according to this invention I provide two such annular cham bers concentric with the bore of thelburn'e'r; air or steam underpressure is delivered to one such chamber and thence to the issuing fuel and air stream, the injection actionthus established causing air to be drawn through suitable apertures into the second annular chamber and thence to the fuel and air stream. Furthermore in the first above described construction, according to the present invention, the means for admitting air from the outside atmosphere to the barrel between the enlargement towardslthe rear end of the barrel and the nozzle of the latter consist of forwardly slopingapertures (ad *vantageously conical or tapering) formed through the wall of the barrel and inclined towards the outlet end of said barrel.

pressure; or said liquid fuel may be delivered into said enlargement in any other suitable manner and by any other suitable means e. g. axially with the incoming jet of air under pressure through an annular aperture surrounding the nozzle through which the said air or steam is projected.

The burner is provided with a lug 0r support on the underside thereof by which same can be mounted (in the known manner) so as to be capable of tilting or otherwise.

One form of burner constructed according to my present invention is illustrated in Figs. 1 to 7 of the accompanying drawings, in which r v Fig. 1 is a plan view showing the position of the liquid fuel inlet to the circular enlargement and the air or steam inlet to the annular chamberin the barrel towards the outlet end of the burner.

' view.

Fig. 2 is a central vertical sectional view on the line 22 Fig. 1.

Fig. 3 is a front end view looking in the Fig. 6 is a central longitudinal section of the injector nozzle and Fig. 7 a front end view of the same.

Figs. 8 to 17 show an alternative construction. Fig. 8 is a view inside elevation of this construction of burner.

Fig. 9 is an end view of Fig. 8 looking in the direction of the arrow a.

Fig. 10 is a front end View of Fig. 8 looking in the direction of the arrow 6.

Fig. 11 is avertical longitudinal sectional Fig. 12 is a transverse sectional View on line c0 Fig. 8. v Fig. 13 is a central longitudinal sectional viewjof the barrel portion of a burner constructed according to this invention.

Fig. 14: is a similar longitudinal sectional view of the air or steam injector portion.

air stream issuing from the bore of the Fig. 15is a similar view of the air or steam injector nozzle.

Fig. 16 is a similar view of an inner sleeve adapted to be screwed over the barrel portion shown in Fig. 13; and

Fig. 17 isv a similar view of an outer cylindrical sleeve adapted to be screwed over the inner sleeve shown in Fig. 16.

As illustrated in Figs. 1 to 7 of these drawings one form of burner constructed according to this invention comprises two principal parts viz, the main part or barrel 20 and the fore-part or cylindrical sleeve 21.

The said main part 20 is provided with a boss 22 internally screw-threaded for attaching. thereto the liquid fuel supply pipe. An aperture 23 admits the liquid fuel to the circular chamber 24 to which also air is drawn in through a plurality. of tapered apertures 25 by the action of the air or steam injector 26 which is screwed into a boss 27 on the main part 20. 7

Air is also admitted to the barrel portion of the main part A through inclined and tapered apertures 28.

The fore-part or cylindrical sleeve 21 is adapted to be tightly and rigidly screwed to the front portion of the main part 20 and is provided with a downwardly projecting extension 29 by which the burner can be attached to or mounted adjustably or otherwise on any suitable support.

A boss 30 is provided on the cylindrical sleeve 21 and is internally screw-threaded to rected at an acute angle to the longitudinal axis of the barrel into the ignited fuel and burner, and is thereby intimately mixed therewith.

This said converging stream of air or steam may be directed from a ring of inclined apertures or from an inwardly inclined annular orifice 82.

As shown in Figs. 8 to 17 of the accompanying drawings ;-,the air or steam injector comprises two parts viz, (a) an outer casing 33 which is adapted to be screwed into the enlargement 3 1 ofthe barrel portion 35, the bore of this outer casing 33 tapers slightly in the directionof its attachment to the barrel 35 and (b) a removable nozzle 36 having a tapering bore and pro vided with a circular boss or flange .37.

surface of the outer casing 33 an annular space 38 (Fig. 11); lhe bosses or flanges 39 and 40 are provided on this outer casunder pressure causes the additional suping 33and are internally screw-threaded to permit the attachment thereto of the fuel inlet pipes leading to any suitable source.

Tapered apertures 39 and do 'form sepa rate liquid fuel inlets to the annular chamber 38 and said liquid fuel is drawn by the injector action of the air orsteam through the nozzle 36 into the circular enlargement 34 through the annular opening 4E1 which is the end of the annular chamber 38 formed between the outer surface of the nozzle 36 and the inner surface of the outer casing 33.

Apertures 42 are provided in the rear end of the enlargement 34: for the purpose of admitting an extra supply of air under the injector act-ion of the incoming air or steam under pressure.

To provide for the intimate mixing of a further supply of air or steam to the mixed fuel and air issuing from the burner 1 provide a cylindrical sleeve 4.2-3 adapted to be screwed over the barrel portion 35 against a flange 35 formed thereon.

This sleeve d3 is so formed and proportioncd as to leave between its inner surface and the outer surface of the barrel 35 an annular chamber as terminating at the nose end thereof in an inwardly inclined annular slot or aperture M the outer sleeve formed similarly to the inner sleeve 43 is screwed on over said sleeve 43 and 18 so formed and proportioned as to leave an annularcham ber l6 similar to thechamber a l (and correspondingly inwardly inclined at the forward end 46 thereof) between its inner surface and the outer surface of the inner sleeve 43. a

An aperture 4:7 is provided in the sleeve 43 and a boss 4L8 is formed on the sleeve having a passage therethrough and provided With screw-threads for attaching thereto a. pipe or conduit from any suitable source of air or steam under pressure.

A tapering nozzle 50 connects the inlet pipe for the air or steam under pressure to the annular chamber 44.

This nozzle 50 is detachable and is placed in position after the sleeves 4:3 and 45 are screwed into position as before described, with the aperture 4&7 and'the boss 48 registering.

The aperture 51 and passages, 52 are formed in the screwed flange of the inner sleeve 43 for the purpose of admitting to the annular chamber 46 air from the atmosphere. a

The action of this part of the burner is as follows-:- a

Air or steam is admitted to the inner anclined annular slot or aperture 44 into the mixed fuel and air stream issuing from the bore. y I, i

The in ector action of this air or steam ply of airto be drawn in through the apertures 51 and passages "52 to the'outer annu-l lar chamber .6 and this additional air is drawn through the inwardly inclined slot or aperture d6. v

Thus the two streams of air or steam are so directed as to converge all round on and become intimately mixed With the main fuel and air stream issuing from the bore.

Instead of employing liquid hydrocarbons as the fuel for this burner gas may be used as the fuel'in this burner or burner apparatus according to this invention and such burnerbeing designed and adapted to burn either gas or liquid hydrocarbons as the fuel; e. g. gas from the ordinary town gas'supply may be used in this burner or any. other suitable combustible gas.

What I claim is I 1. A liquid hydrocarbon burner of the inyector type comprising a barrel whereof the major portion of the bore increases regw larly in eross'sectional areatowards the nose end of said bore, said barrel having a circular enlargement of said bore at the rear end of said bore, an injector nozzle for injecting gas under pressure arranged co-axially Wit-h the bore in the rear Wall of said enlarg ment, means to admit liquid hydrocarbons directly into said enlargement, and means to direct an auxiliary supply of gas under pressure in sharply converging streams on to the main stream of fuel mixture issuing from the nose of the burner, substantially as de scribed. I r

2. A liquid hydrocarbon burner of the injector type comprising a barrel whereof the major portion of the bore increases regularly in cross sectional area towards the nose end of said bore, said barrel having a circular enlargement of said bore at the rear end of said bore, an injector nozzle for injectlargement, an annular chamber concentric with and surrounding said injector nozzle for the supply through said annular chamber of liquid hydrocarbons into said en largement at the rear end of (the'bore of the burner, and means to direct an auxiliary supply of under pressure in sharply converging streams on to the main stream of fuel nurture issuing from the nose of the burner, substantially as described.

3. liquid burner of the injector type comprising a barrel having a conical bore, said barrel having an enlargement of the bore at the small end of the latter, an injector nozzle co-axial with said bore, and ar-' ranged to deliver gas'undcr pressure into the rear of said enlargement, means to adllil) mib fuel directly to said enlargement, two an inlet to ne of said annular chambers for concentnc. cyhndrlcel sleeves arranged on supplymg' thereto gasunderpressure, and

.7 ,the fo-re-part of the burner and forming an inlet to theether said aimu'lar chamber two concentric annular chambers each hav for echhifeiqing airfrom the atmosphere. 5 ing the'outlet' thereirom mehned lnwardly v r 1 I I I V at an acute angle to the bore of the burner, v I LUDWVIG GRQTE. 

